* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
.container {
    width: 90%;
    /* height: 100px; */
    background: rebeccapurple;
    margin: 50px auto;
    display: flex;  /* flex y排序*/
    flex-wrap: wrap; /* 折行吗 */
    justify-content: center; /* x */
    align-items: center;/* y */
}

.one{
    width: 150px;
}
.two{
    width: 250px;
    flex-grow: 1;
    align-self: flex-end; /* 操作单个 y */
}
.three{
    width: 300px;
}